how old are my guns?

i'm new here but, would love to know the age of my revolvers. Any help is appreciated- model 629 N8737xx, model 686 AHY59xx, model 396 dch63xx. the 396 is obviously newer, but i'm still curious. thanks,Pete

Model 629 - 1980-1983
Model 686 - Although not specific, I would guess 1985-1986
Model 396 - Again not specific, 2003-2004
When S&W went to the 3 letter prefix they didn't use them in sequence, nor did they use all of them before moving on to the next.

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